The Free Software Song is a filk song by Richard M. Stallman about free software. The song is set to the melody of the Bulgarian "Sadi Moma".
Jamie Zawinski links to the song as "further evidence of why co-operation with Stallman is impossible".[1]
A version of this song is also performed by a band (the GNU/Stallmans) during the credits of the documentary Revolution OS. In 1998, Matt Loper recorded a techno version of the song.[2] Jono Bacon also recorded a death metal version of the song,[3] and the band Fenster recorded a rhythmic version.[4] In addition, there is a Spanish pop punk version recorded by ALEC, and a Rick Astley mashup.
A version is used in the free software karaoke video game Sinatra.[5]
The lyrics have been placed in the public domain.[6]